An experiment is done to measure the uptake of an amino acid into a cell. The following data are obtained
If Na+ is removed from the extracellular bathing solution, or a drug is added that prevents the cell from making ATP, the uptake of amino acid into the cell is markedly reduced. Based on this information which of the following mechanisms is likely responsible for the transport of the amino acid into the cell?
A. passive diffusion through the lipid bilayer
B. uniporter
C. transport ATPase
D. Na+ symporter
E. Na+ antiporter
ANS: D
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